The best way to 'fix' Stop Start is to pull the auxiliary battery fuse !
Any idea where this is on a 2015 c250. Itll save me pressing that damn button.
I actually like stop start. in essence as it must be good for the environment. But it has its flaws, batteries need replacing fairly (too) often, and it puts strain other components.
Stop start needs a well charged aux battery/capacitor. Are you sure its switched on.
Regarding the question, its pure guesswork, get it plugged into STAR
Sound advice. Solid !!Read your fuse chard
Are there published vonditions for battery health.They might work but not sufficiently well to meet the requirements of stop start